# CVE-2017-3826: Denial of service in Cisco NetFlow Generation Appliance

> Remote attackers can cause denial of service on Cisco NetFlow Generation Appliances by sending malformed SCTP packets to monitored data ports.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Mar 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-6m6f-4vpp-rg9h

## What is CVE-2017-3826?

CVE-2017-3826 is a high-severity denial of service vulnerability in Cisco NetFlow Generation Appliance, published on 1 Mar 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the Stream Control Transmission Protocol (SCTP) decoder of the Cisco NetFlow Generation Appliance (NGA) with software before 1.1(1a) could allow an unauthenticated, remote attacker to cause the device to hang or unexpectedly reload, causing a denial of service (DoS) condition. The vulnerability is due to incomplete validation of SCTP packets being monitored on the NGA data ports. An attacker could exploit this vulnerability by sending malformed SCTP packets on a network that is monitored by an NGA data port. SCTP packets addressed to the IP address of the NGA itself will not trigger this vulnerability. An exploit could allow the attacker to cause the appliance to become unresponsive or reload, causing a DoS condition. User interaction could be needed to recover the device using the reboot command from the CLI. The following Cisco NetFlow Generation Appliances are vulnerable: NGA 3140, NGA 3240, NGA 3340. Cisco Bug IDs: CSCvc83320.

Weakness: CWE-20 (Improper Input Validation), CWE-399

## Which versions are affected by CVE-2017-3826?

It affects 1 product.


Products: Cisco Netflow Generation Appliance Software.

## How do I fix CVE-2017-3826?

No fix has been published for CVE-2017-3826 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-3826 being exploited?

There is no known exploitation of CVE-2017-3826 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-3826 and fix it if it is affected.

What it is: CVE-2017-3826 is a high-severity denial of service vulnerability in Cisco NetFlow Generation Appliance, published on 1 Mar 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2017-3826 in the wild and no public exploit code.

Affected product: Cisco NetFlow Generation Appliance. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2017-3826/ (Markdown: https://insights.sbomify.com/CVE-2017-3826/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-3826
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-3826
- OSV: https://osv.dev/vulnerability/CVE-2017-3826

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-3826/
Summaries are generated and may contain mistakes; the official description above is the record.